He said: “If Tom Cruise is man enough to accept this challenge, McGregor Sports and Entertainment will host the bout.”

“Does Cruise have the sprouts to fight, like he does in the movies?” asked the Irish sportsman on Twitter.

It was unclear what prompted Bieber to issue the challenge.

If Tom Cruise is man enough to accept this challenge,McGregor Sports and Entertainment will host the bout.Does Cruise have the sprouts to fight, like he does in the movies? Stay tuned to find out! https://t.co/TxsH9KUyFg